Firstly, I hope I'm asking this question on the right SE website. While this could be Mac related, I don't think so, which is why I'm here and not on Ask Different.
I have built a Windows 8.1 gaming machine on a 2009 Mac Pro, upgraded to 5,1. I'm using a flashed GTX 980 connected via display port to an Acer X34 Predator. For months, I've been using G-Sync and it has worked flawlessly. For the last few weeks, however, G-Sync keeps getting disabled and when I go into the NVIDIA Control Panel, the option doesn't even show.
I followed these instructions, which basically say turn everything off, disconnected then reconnect everything, and then turn it back on and voila! G-Sync is back! However, it keeps intermittently going away.
Thinking it might be a video driver issue, I rolled-back to the previous version, but that didn't bring it back until I perform the steps above.
Since posting this question, I have noticed that everytime I start Windows from a cold start, I loose my G-Sync setting in NVIDA Control Panel. Now my routine is while in Windows, if I just remove the DP cable and reconnect it, the setting comes back.
Any idea what might be causing me to loose my G-Sync features?
